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Proper management of bone mass during pregnancy is indispensable for women to prevent osteoporosis in later age. The calcanel stiffness of 100 pregnant women was measured and an investigation by questionnaire was carried out on their nutrient intake and dietary awareness and behavior at three stages of pregnancy: early, middle and later stages at 3-4-month interval.The average stiffness decreased during the last stage, but it didn't change or increased in 25% of the subjects. Dietary awareness was significantly higher in this 25% group at the early stage of pregnancy, and the nutrient intake, particularly of calcium and vitamin A, tended to be higher in the middle stage. A close link was apparent between the past milk intake and the change in stiffness, but not between the past degree of exercise and the bone change.The result of the calcanel stiffness increasing in the pregnant subjects who took more milk, calcium and other nutrients with positive dietary behavior indicates that a nutrient intake of high quality contributed to healthy bones. It is important to improve dietary habits during both pregnancy and the pre-pregnant period.

Relationships between Factors in Daily Life and Changes in the Calcanel Stiffness during Pregnancy